User Manual for GSM Modem

User Manual for GSM Modem

Tags: User manual for m10 gsm modem,gsm/gprs configuration setting for m10 , quectel m10 user manual, quectel m10 at commands,
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1. QUECTEL-M10 Overview

  • The M10 is a Quad-band GSM/GPRS engine that works at frequencies GSM850MHz, GSM900MHz, DCS1800MHz and PCS1900MHz. The M10 features GPRS multi-slot class 12 and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. For more detail about GPRS multi-slot classes and coding schemes, please refer to Appendix A and Appendix B.
  • With a tiny profile of 29mm x 29mm x 3.6 mm, the module can meet almost all the requirements for M2M applications, including Tracking and Tracing, Smart Metering, Wireless POS, Security, Telematics, Remote Controlling, etc.
  • The M10 is an SMD type module, which can be embedded in customer application through its 64-pin pads. It provides all hardware interfaces between the module and customer’s host board.
  • The module is designed with power saving technique so that the current consumption is as low as 1.1 mA in SLEEP mode when DRX is 5.
  • The M10 is integrated with Internet service protocols, which are TCP/UDP, FTP and HTTP. Extended AT commands have been developed for customer to use these Internet service protocols easily.
  • The modules are fully RoHS compliant to EU regulation

2. Specifications

  • On-Board Voltage Regulator | Signal Indicators |Hands Free
  • RJ-11 connector for Phone head set interface
  • DB9 Con or USB con for Host or MCU Interface, control by AT commands.

General Features

  • Quad-Band GSM/GPRS 850/900/1800/1900MHz
  • GPRS multi-slot class 10/8
  • GPRS mobile station class B
  • Compliant to GSM phase 2/2+ Class 4 (2W @ 850/900 MHz) | Class 1 (1W @ 1800/1900MHz)
  • Control via AT commands (GSM 07.07, 07.05)

Specifications for Data

  • GPRS class 12: max. 85.6 kbps (uplink &downlink)
  • PBCCH support
  • Coding schemes CS 1, 2, 3, 4
  • CSD up to 14.4 kbps
  • USSD
  • Non transparent mode
  • PPP stack
  • TCP/IP stack

Specifications for Fax

  • Group 3, class 1

Specifications for SMS via GSM

  • Point-to-point MO and MT
  • SMS cell broadcast | Text and PDU mode

Specifications for voice

  • Tricodec Half rate |Full rate | Enhanced Full rate
  • Hands-free operation (Echo suppression)


  • Interface to external SIM 3V/1.8V
  • Two analog audio interfaces
  • RTC backup

3. General Block Diagram

Power Supply

The external power can be AC or DC, with a voltage between (9V/12V,1A output) at 230V AC input. The GSM Modem board produces +5V using an LM7805 voltage regulator, which provides supply to the GSM Module.

Light Emitting Diodes

Light Emitting Diodes (LEDs) are the most commonly used components, usually for displaying pin’s states.


Point LEDs

GSM Board

LED Selection

LED Indicators






Network signal

RS-232 Communication (UART)

  • RS-232 communication enables point-to-point data transfer. It is commonly used in data acquisition applications, for the transfer of data between the microcontroller and a PC.
  • The voltage levels of a Modules and PC are not directly compatible with those of RS-232, a level transition buffer such as MAX3232 be used.


UART DB-9 Connector


Serial Port Section



Pin-2 (TXD)




Pin-3 (RXD)


Getting Started

  • Insert SIM card: Press to remove the tray from the SIM cardholder. After properly fixing the SIM card in the tray, lock the tray in the slot provided.
  • Connect Antenna: Screw the RF antenna on the RF cable output provided.
  • Connect RS232 Cable to the Host device: (Cable provided for RS232 communication)
    - Note: Default baud rate is 9600 with 8-N-1, no hardware handshaking.
  • Connect the power Supply (9V-AC/DC) to the power jack. Incase of DC polarity should be Center +ve and outer –ve on DC jack.
  • Network LED indicating various status of GSM module eg. Power on, network registration & GPRS connectivity.
  • After the Modem registers the network, led will blink in step of 3 seconds. At this stage you can start using Modem for your application.
  • AT commands set section is covered in following document
    Note : This symbol refers to {← } carriage return

Trouble Shooting

  • Note : when GSM modem powers on the auto baud is enabled, user must first to send the “A” to synchronize baud rate. It is recommended to wait 2 to 3 seconds before sending “AT” character. After receiving the “OK” response, PC and modem are correctly synchronized.
  • Serial cable (DB9 Male to Female) must be straight connection (2-2 & 3-3and 5-5)
  • Ensure the the sim card holder/ connector has the SIM card.
  • It is not advised to connect or disconnect any external devices which are not recommended by the product reference manual.
  • It is risky to connect power supply not preferred by the reference user manual
  • In case of any malfunction in the product, please let us know.

To check the modem AT{}
To change sms sending mode AT+CMGF=1{}

To Read SMS in Text mode:
AT+CMGR= no.
Number (no.) is the message index number stored in the sim card. For new SMS, URC will be received on the screen as +CMTI: SM ‘no’. Use this number in the AT+CMGR number to read the message.

Example :
"REC READ","+917708283043","","10/05/21,20:52:20+22"

To Send SMS in text mode :
AT+CMGS=”mobile number” press enter Once The AT commands is given’ >’ prompt will be displayed on the screen. Type the message to sent via SMS. After this, press ctrl+Z to send the SMS. If the SMS sending is successful, “ok” will be displayed along with the message number.

Example :
< Hello GSM Modem CTRL+Z

To make a voice call ATD9884467058; { }
To Redial last no ATDL{ }
To Hangup or Disconnect a call ATH{ }
For receive incoming call ATA{ }
To set a particular baudrate

AT+IPR= ?{ } {To view the baud rate values}
AT+IPR=0 {To set the modem to autobauding mode}

Operator selection AT+COPS? { }

+COPS: 0,0,"AirTel"

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